Answer: When you create a document in Microsoft Publisher or any desktop publishing program, in order for others to open and view the file they would normally have to have the same program. If they don't, there are ways you can convert your creation to a format that others can use.
For other uses, see Epidemiology (disambiguation). Epidemiology is the study and analysis of the patterns, causes, and effects of health and disease conditions in defined populations. It is the cornerstone of public health, and shapes policy decisions and evidence-based practice by identifying risk factors for disease and targets for preventive healthcare.
In other words, descriptive epidemiology describes the distribution of disease (recall that epidemiology is the study of the distribution and determinants of disease in populations).escriptive epidemiology seeks to summarize conditions based on person, place, and time by analyzing disease (or other outcomes of exposure) patterns.